Oskar Stillich (1872–1945):
Die Lage der weiblichen Dienstboten in Berlin
1902
Source: http://books.google.com/books?id=STkEAAAAYAAJ
Pulic Domain in the United states (published before 1923).
Public Domain in Germany and other countries of the European Union from January 1st, 2016 (70 years after 1945, the year of the author's death).